Arizona's primary election Tuesday features a spirited race for the Republican nomination for U.S. Senate and heated contests for several U.S. House seats, with outcomes that will set the roster of candidates for the Nov. 6 general election.

Every month for the next two decades, 50,000 Latinos will turn 18 years old. With that many new eligible voters, and dramatic population growth expected, Latinos could dominate voting in the Southwest, particularly Texas, Arizona, New Mexico and Colorado, according to the Pew Hispanic Center, a project of the Pew Research Center.

Once the Aug. 28 primary results are tallied, 29 of Arizona’s 90 legislative races will be decided.

Nine Senate candidates already have a guaranteed seat. Two more Senate seats and 18 House seats will be won after the primary because only candidates from one party are competing, so whoever wins the primary can start measuring their legislative office drapes.

Congressional District 5 GOP hopeful Kirk Adams received a last-minute boost from Congressman and U.S. Senate candidate Jeff Flake today when Flake endorsed Adams over his primary election opponent, former U.S. Rep. Matt Salmon.